Description

Fixes #20276

Hides the "empty template" messages from logged out visitors.
Adds the template title to the message. Example message: Empty template: Index.

How has this been tested?

1. Follow the instructions in the GitHub issue to reproduce the problem.
2. When logged in: confirm that the message shows on the front and that the title of the template is included.
3. When logged out: confirm that the message does not show on the front.

Types of changes

Enhancement

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.